libraries/mcrypt.lib.php

   1 <?php
   2 /* vim: set expandtab sw=4 ts=4 sts=4: */
   3 /**
   4  *
   5  * @version $Id$
   6  */
   7 if (! defined('PHPMYADMIN')) {
   8     exit;
   9 }
  10
  11 /**
  12  * Initialization
  13  * Store the initialization vector because it will be needed for
  14  * further decryption. I don't think necessary to have one iv
  15  * per server so I don't put the server number in the cookie name.
  16  */
  17 if (empty($_COOKIE['pma_mcrypt_iv'])
  18  || false === ($iv = base64_decode($_COOKIE['pma_mcrypt_iv']))) {
  19     srand((double) microtime() * 1000000);
  20     $iv = mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_BLOWFISH, MCRYPT_MODE_CBC), MCRYPT_RAND);
  21     PMA_setCookie('pma_mcrypt_iv', base64_encode($iv));
  22 }
  23
  24 /**
  25  * String padding
  26  *
  27  * @param   string  input string
  28  * @param   integer length of the result
  29  * @param   string  the filling string
  30  * @param   integer padding mode
  31  *
  32  * @return  string  the padded string
  33  *
  34  * @access  public
  35  */
  36 function full_str_pad($input, $pad_length, $pad_string = '', $pad_type = 0) {
  37     $str = '';
  38     $length = $pad_length - strlen($input);
  39     if ($length > 0) { // str_repeat doesn't like negatives
  40         if ($pad_type == STR_PAD_RIGHT) { // STR_PAD_RIGHT == 1
  41             $str = $input.str_repeat($pad_string, $length);
  42         } elseif ($pad_type == STR_PAD_BOTH) { // STR_PAD_BOTH == 2
  43             $str = str_repeat($pad_string, floor($length/2));
  44             $str .= $input;
  45             $str .= str_repeat($pad_string, ceil($length/2));
  46         } else { // defaults to STR_PAD_LEFT == 0
  47             $str = str_repeat($pad_string, $length).$input;
  48         }
  49     } else { // if $length is negative or zero we don't need to do anything
  50         $str = $input;
  51     }
  52     return $str;
  53 }
  54 /**
  55  * Encryption using blowfish algorithm (mcrypt)
  56  *
  57  * @param   string  original data
  58  * @param   string  the secret
  59  *
  60  * @return  string  the encrypted result
  61  *
  62  * @access  public
  63  *
  64  * @author  lem9
  65  */
  66 function PMA_blowfish_encrypt($data, $secret) {
  67     global $iv;
  68     // Seems we don't need the padding. Anyway if we need it,
  69     // we would have to replace 8 by the next 8-byte boundary.
  70     //$data = full_str_pad($data, 8, "\0", STR_PAD_RIGHT);
  71     return base64_encode(mcrypt_encrypt(MCRYPT_BLOWFISH, $secret, $data, MCRYPT_MODE_CBC, $iv));
  72 }
  73
  74 /**
  75  * Decryption using blowfish algorithm (mcrypt)
  76  *
  77  * @param   string  encrypted data
  78  * @param   string  the secret
  79  *
  80  * @return  string  original data
  81  *
  82  * @access  public
  83  *
  84  * @author  lem9
  85  */
  86 function PMA_blowfish_decrypt($encdata, $secret) {
  87     global $iv;
  88     return trim(mcrypt_decrypt(MCRYPT_BLOWFISH, $secret, base64_decode($encdata), MCRYPT_MODE_CBC, $iv));
  89 }
  90
  91 ?>